Mode of actuating governor-valves of steam-engines



UNITED STATES PATENT OFFIOE.

PETER L. WEIMER, OF LEBANON, PENNSYLVANIA.

M ODE OF ACTUATING GOVERNOR-,VALVES OF STEAM-ENGINES.

Specification of Letters Patent No. 27,939, dated April 17, 1860.

To all whom it may concern:

Be it known that I, PETER L. WEIMER, of Lebanon, in the county ofLebanon, in the State of Pennsylvania, have invented a new and ImprovedMode of Actuating the Grovernor-Valve of a Steam-Engine; and I do herebydeclare that the following is a full, clear, and exact description ofthe construction and operation of the same, reference being had to theannexed drawings, making a part of this specification, in which- Figureis a front view part elevation part section. Fig. 2 is a side view alsopart in Section. Fig. 3 is a view on the line fz, a the letters ofreference in all the figures corresponding.

A is the valve chest being in this case two simple wing throttle valves,or it may be made7as shown in the modification Figs. 4, 5, e, 1

B is the governor frame bolted to the top of the valve chest A andforming its cover. On this frame is secured the governor C, with ahollow spindle through which works the racked rod D, the lower end ofwhich has a screw thread cut on it and carries the small cross-head Esecured between jam nuts.

F are two small levers hung on their centers G one end of which leversis fastened to the cross-head E the other end to the lugs on the slidingrock-shaft boxes H.

I is a rock-shaft rocking in the boxes H and having fastened at its endsthe arms J, in which arms are placed the spring latches K, or these armsmay be made without latches, as shown in the modification Fig. et.

L are the spindles of the throttle valves working through packing boxesin the valve chest A and have fastened on their ends the arms M.

N is a small arm projecting from the arm M to the end of which isjointed the screw threaded rod O, working through a hole in the plate P,said plate being securely fastened to the body of the valve chest A.

R are jam nuts on the rod O and between which and the plate P is placedthe circular pieces of india rubber S to act as a buffer.

Q are also jam nuts on the rod O and between which and the plate P isthe spiral spring U.

The arms M may be made as in the modication Fig. 4 which dispenses withthe smaller arms N and with the spring latches in the arms J as abovementioned.

The manner of operation is as follows. A rocking motion is communicatedto the shaft I (by means of an eccentric and rod on the engine shaft)fastened to the arm vW the eccentric being set so as to slightly leadthe main crank of the engine so that one of the throttle valves will bepartly open at the commencement of the stroke of the engine. The rockingof the shaft I operating on the arms M alternately open the throttlevalves and admit the steam to the steam chest of the engine where it isdistributed to the respective ends of the cylinder by the main valve orvalves.

To fully illustrate the mode of operation we will suppose the engine tobe running and it is desired to cut off the steam at half stroke. Thesmall cross head E is lowered on the spindle D (which raises the slidingboxes I-I of the rock-shaft I to which it is connected by the levers F)until the arms J detach themselves from the arms M when the engine is onhalf stroke. The moment the arms M are detached the spiral spring Uacting on the arm N through the rod O suddenly closes the valve, the amnuts R with the pieces of india rubbers S between them and the plate Pare so adjusted that the valve is closed at the same time that the indiarubber S strikes the plate P which prevents the valve being destroyed byits sudden closing. The jam nuts Q below the spiral spring U can beraised or lowered so as to increase or decrease the power required toclose the valve. It will thus be seen that the rod O thus performs thedouble function of closing the valve and arresting its motion at theproper point. It will also be seen that should the engine from knowncauses change its speed slightly so as to effect the governor balls thatthe shaft I will be raised or lowered which will leave the arms M and Ilin contact with each other a greater or less length of time consequentlyadmitting more or less steam into the cylinder as the case may require.

The advantage of this the herein described arrangement being that ofcompactness and less power being required to open and close the valves,which power being expended on the latches they will consequently lastmuch longer without renewal.

ernor spindle D as herein described and specied.

3. I also claim the rods O Working through the plate P With the jam nutsR india rubber buffer S and spiral spring U With the adjusting jam nutsQ in 'combination With the arm N on the valve rod L for the purpose asherein more fully described and specified.

PETER L. WEIMER. Witnesses:

WILLIAM REINOCHT, GEORGE STRICKLER.

